19. B is the chemical symbol of which element?

Boron

Boring

Balkite

Beryllium

20. Zinc (Zn) has an atomic number of 30 and an atomic mass of 65. How many neutrons does a stable atom of Zn have?

30

35

60

95

What is one disadvantage of out free market society

Given: g on moon = - 1.63 meters/second2

Which class of biomolecule do molecules belong to

Scientists publish a revised list of dangerous greenhouse gases. Which statements describe the importance of this information? Check all that apply. It confirms the need for oil fracking to produce energy.

2. How many electrons does barium have to give up to achieve a noble-gas electron configuration? 1 2 3 4 ... ?

A 0.239 gram sample of a gas in a 100-mL flask exerts a pressure of 603 mm Hg at 14 degrees Celsius. What is the gas?

Which of the following is true about a redox reaction? In a redox reaction, an electron is lost by the reducing agent. In a redox reaction an electron is lost by the oxidizing agent.

Is the equation above balanced? How do you know? Mg + 2HCl → MgCl2 + H2

What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common?

Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent? A. Decreasing pressure B. Decreasing surface area C. Increasing rate of stirring D. Increasing temperature